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<td><h1>CodeIgniter User Guide Version 2.1.3</h1></td>
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<h1>Error Handling</h1>
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<p>CodeIgniter lets you build error reporting into your applications using the functions described below.
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In addition, it has an error logging class that permits error and debugging messages to be saved as text files.</p>
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<p class="important"><strong>Note:</strong> By default, CodeIgniter displays all PHP errors. You might
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wish to change this behavior once your development is complete. You'll find the <dfn>error_reporting()</dfn>
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function located at the top of your main index.php file. Disabling error reporting will NOT prevent log files
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from being written if there are errors.</p>
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<p>Unlike most systems in CodeIgniter, the error functions are simple procedural interfaces that are available
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globally throughout the application. This approach permits error messages to get triggered without having to worry
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about class/function scoping.</p>
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<p>The following functions let you generate errors:</p>
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<h2>show_error('<var>message</var>' [, int <var>$status_code</var>= 500 ] )</h2>
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<p>This function will display the error message supplied to it using the following error template:</p>
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<p><dfn>application/errors/</dfn><kbd>error_general.php</kbd></p>
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<p>The optional parameter $status_code determines what HTTP status code should be sent with the error.</p>
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<h2>show_404('<var>page</var>' [, '<var>log_error</var>'])</h2>
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<p>This function will display the 404 error message supplied to it using the following error template:</p>
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<p><dfn>application/errors/</dfn><kbd>error_404.php</kbd></p>
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<p>The function expects the string passed to it to be the file path to the page that isn't found.
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Note that CodeIgniter automatically shows 404 messages if controllers are not found.</p>
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<p>CodeIgniter automatically logs any show_404() calls. Setting the optional second parameter to FALSE will skip logging.</p>
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<h2>log_message('<var>level</var>', '<samp>message</samp>')</h2>
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<p>This function lets you write messages to your log files. You must supply one of three "levels"
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in the first parameter, indicating what type of message it is (debug, error, info), with the message
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itself in the second parameter. Example:</p>
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if ($some_var == "")<br />
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log_message('error', 'Some variable did not contain a value.');<br />
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log_message('debug', 'Some variable was correctly set');<br />
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log_message('info', 'The purpose of some variable is to provide some value.');<br />
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<p>There are three message types:</p>
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<li>Error Messages. These are actual errors, such as PHP errors or user errors.</li>
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<li>Debug Messages. These are messages that assist in debugging. For example, if a class has been initialized, you could log this as debugging info.</li>
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<li>Informational Messages. These are the lowest priority messages, simply giving information regarding some process. CodeIgniter doesn't natively generate any info messages but you may want to in your application.</li>
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<p class="important"><strong>Note:</strong> In order for the log file to actually be written, the
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"logs" folder must be writable. In addition, you must set the "threshold" for logging in <dfn>application/config/config.php</dfn>.
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You might, for example, only want error messages to be logged, and not the other two types.
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If you set it to zero logging will be disabled.</p>
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